in the crust during the high pressures and temperatures produced when an extraterrestrial body strikes the earths surface to form impact diamonds from carbon-rich targets (graphite to diamond solid-state transition) or impact melts. Antarctica (which lay farther from the, south Pole than today) and which supposedly left evidence (the "fingerprints" of the title). The thermal pulse revealed by the study of crustal rocks at the surface is thought to result from a tectonic process that heated and recrystallized older lithospheric mantle while permitting the formation of diamonds at the same time (Smit., 2010). Associated with mantle convection is the subduction of oceanic lithosphere.
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Recent Advances in Understanding the Geology of Diamonds
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South doll's house essay African Journal of Geology, Vol. Summary OF THE geology OF diamonds The past 25 years have seen scientific research answer many of the basic questions about gem-quality diamonds. Although simplified systems are an insightful starting point, fluids and melts in the lithospheric mantle will react with silicate minerals in peridotite or eclogite, which can lead to a wide range of chemically diverse compositions as seen, for example, in fibrous diamonds. Diamonds in Tectonically Active Areas. For eclogitic diamonds, Cr-poor garnets (high Na Ti) and diopside (high Na) are commonly used. For example, a common reaction in peridotites involves enstatite and magnesite, which react to form olivine and diamond in the presence of a fluid. (2011) Deep mantle cycling of oceanic crust; evidence from diamonds and their mineral inclusions. Note that only the cratonic lithospheric keel is cold enough at high enough pressures to retain diamonds. Carbon in the earth can occur in oxidized forms, such as when bound with oxygen in CO2 or CO3, or in reduced forms such as diamond, graphite, or bound with hydrogen in methane and other organic molecules.
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